SwitchBlox - Small Ethernet Switch

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  • Buy 10 - 99 and get 3% off
  • Buy 100 - 499 and get 8% off
  • Buy 500 - 999 and get 12% off
  • Buy 1000 or above and get 20% off
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The Ethernet Switch built for Compact Tech

Management or PoE features are no longer available on SwitchBlox. These features are now available on SwitchBlox Industrial

SwitchBlox is a small ethernet switch with five 10/100MB ports, specifically designed for space-constrained and noisy environments.

With an overall size of 44.5mm (1.75 inches) by 44.5mm (1.75 inches), SwitchBlox is the smallest network switch in the world, making it perfect for robots, drones, or any space-limited networking application.

Diagram showing the small ethernet switch in a typical robotics network

Plug and play network switch

As an unmanaged network switch, it works straight out the box, all you need to do is...

  1. Apply a 5 to 60V DC supply.
  2. Connect your devices using the included cable set.
  3. It will automatically begin forwarding packets, no coding or setup needed.


We've squeezed all necessary Ethernet circuitry into SwitchBlox without making performance compromises. We use magnetics for improved signal integrity and electrical isolation between each ethernet bus.

Dimensions of the micro ethernet switch


We use Molex Picoblade connectors on all our boards to keep them tiny. All boards ship with a cable set included, which consists of...

5 x PicoBlade to RJ-45 300mm (SKU: BB-PBRJ1-4-0.3)
Diagram of the SwitchBlox Data Cable
1 x PicoBlade to bare wires 300mm (SKU: BB-PBTL1-4-0.3)
Diagram of the Universal Power Cable

Ethernet Pinout

Below is a handy graphic that shows how we transition from a Molex Picoblade pinout to the standard RJ-45 ethernet cables. For 10/100 Mbps ethernet we use two differential channels, transmit and receive, for a total of four conductors.

Diagram showing the pinout of the 10/100BASE-T signals on the board and on the RJ-445 connector

Switch Management Features (VLAN, Port Mirroring)

Management features such as VLAN (Port and tag-based) and Port Mirroring is possible on SwitchBlox by using our open-source firmware and software package. To configure this, read our software guide or get in touch for support. 

Passive PoE injection onboard

We’ve added circuitry to SwitchBlox that allows you to inject voltage onto any combination of the ports, simply by toggling a DIP switch on the back.

Enabling this feature requires a 0-ohm resistor to be soldered to the board, more information can be found in the datasheet.

PoE Selective Port Injection


Input Voltage Range 5-60V (reverse protected)
Power Consumption 300mW (Idle), 700mW (Max)
Output Voltage 5V, 2A (5V test results)
Ports 5 x 10/100Mb ports
Operating Temperature

-0 to +70°C

Storage Temperature -65 to +150°C
Dimensions 38mm x 38mm x 18mm
PoE 15W (IEEE 802.3af)
HS Tariff Code 8517620000


GrabCAD 3D Models

SwitchBlox Rev E EMC Results

SwitchBlox Revision E Datasheet

Dimensional Drawings

SwitchBlox Dimensional Drawing PDF

SwitchBlox Dimensional Drawing DXF

Custom Cables

All our boards are shipped with the required 0.3 meter power and data cables included, so you do not need to purchase extra cables. However if you need custom cable lengths for your application, you can order those here


Electronics > Networking
Cool Components (UK distributor):
Digi-Key (International distributor):